2003 Cadillac escalade

[HillaryHiggins]

I just recently bought this vehicle and right off the bat it goes into reduce engine power. I put my code reader on it. The codes are P0452 P0446 P1516. I just changed the fuel pump sensor on 3-14-26 and it does the same exact thing. So no change.

 

[LsHart]

P1516 is throttle body correlation code. Replace throttle body. Don't go cheap either cause that will get u right back here. O, might need to relearn. First 2 codes are evap codes.

 

[Fless]

Below is a link to the diagnostic path for P0452. When you get there, verify that I've selected the correct vehicle info; if not, navigate to the similar page for yours.

Using the links at the top of your browser, you can navigate to the diag path for nearly any code. At least look at them; they describe why/how the code gets set.

P0452 — 2003 Cadillac Escalade V8-5.3L VIN T Service Manual | Operation CHARM

Detailed repair manual for the 2003 Cadillac Escalade V8-5.3L VIN T.

charm.li

For the reduced power issue, look at the diag path for that code. Then inspect the wiring from the throttle body back about a foot; one or more wires tend to break under the insulation so it's not readily apparent, but can be discovered by "feel." A new pigtail might be in order. Also clean the throttle body if it's not been serviced lately.

 

[HillaryHiggins]

P1516 is throttle body correlation code. Replace throttle body. Don't go cheap either cause that will get u right back here. O, might need to relearn. First 2 codes are evap codes.

I am aware what the codes are. Hints why I replaced the fuel tank sensor as a start to try and figure out my problem with my vehicle.

 

[HillaryHiggins]

Below is a link to the diagnostic path for P0452. When you get there, verify that I've selected the correct vehicle info; if not, navigate to the similar page for yours.

Using the links at the top of your browser, you can navigate to the diag path for nearly any code. At least look at them; they describe why/how the code gets set.

P0452 — 2003 Cadillac Escalade V8-5.3L VIN T Service Manual | Operation CHARM

Detailed repair manual for the 2003 Cadillac Escalade V8-5.3L VIN T.

charm.li

For the reduced power issue, look at the diag path for that code. Then inspect the wiring from the throttle body back about a foot; one or more wires tend to break under the insulation so it's not readily apparent, but can be discovered by "feel." A new pigtail might be in order. Also clean the throttle body if it's not been serviced lately.

Thank you for your input!

 

[TheAutumnWind]

Below is a link to the diagnostic path for P0452. When you get there, verify that I've selected the correct vehicle info; if not, navigate to the similar page for yours.

Using the links at the top of your browser, you can navigate to the diag path for nearly any code. At least look at them; they describe why/how the code gets set.

P0452 — 2003 Cadillac Escalade V8-5.3L VIN T Service Manual | Operation CHARM

Detailed repair manual for the 2003 Cadillac Escalade V8-5.3L VIN T.

charm.li

For the reduced power issue, look at the diag path for that code. Then inspect the wiring from the throttle body back about a foot; one or more wires tend to break under the insulation so it's not readily apparent, but can be discovered by "feel." A new pigtail might be in order. Also clean the throttle body if it's not been serviced lately.

This fixed my problem with random reduced power codes. Did not replace throttle body.


Good idea to check and clean up all grounds

 

[LsHart]

That's good it's fixed! These are all suggestions and issues that atleast one of us has had. I'm glad it's fixed.

 

[LsHart]

Just by reading the texts. I'm not or wasn't aware you knew. It's all good!

 

[Fless]

Might be a good thing to save the fuel pressure sensor from a removed dead fuel pump, just to have a spare. If it worked before...

 

[TheAutumnWind]

That's good it's fixed! These are all suggestions and issues that atleast one of us has had. I'm glad it's fixed.

Im not OP just chiming in that i had a similar issue and that the recommended ifix worked in my case. Hopefully OP has fixed their issue as well.